First (1st) Substitute Code Flag, Nylon Grommets


The International Code of Signals (ICS) flags are used internationally by vessels to communicate messages regarding safety of navigation and related matters. Individual flags can be hoisted up to display their message to others.

The system was set up by first establishing a standardized alphabet (the letters A through Z and the ten digits), along with a spoken form of each letter.

Single Letter meanings are different and may be made by any method of signaling.  Additionally each letter has its own phonetic spelling.

Repeater Code Word Pronunciation Single Letter Meaning
1st First Substitute First Sub Substitute For the First Flag and also “Repeats” the First Flag.

General Recall

All of our Code of Signal flags are made with 200 denier nylon, sewn throughout with double-stitch seams in approved colors.  Finished with strong Canvas Heading with Brass Grommets. Make sure you check out the other nautical flags that we have listed within the store.

Code of Signal Size Code of Signal Measurements
Size #0 (Zero) 2/3′ x 1 1/3′ (8″ x 16″ / 20cm x 40cm)
Size #2 (Two) 1′ x 2′ (12″ x 24″ / 30cm x 61cm) 
Size #3 (Three) 1 1/3′ x 2 1/3′ (16″ x 28″ / 40cm x 71cm)
Size #7 (Seven) 2′ x 4′ (24″ x 48″ / 61cm x 122cm)
Size #10 (Ten) 2 2/3′ x 5 1/3′ (32″ x 64″ / 81cm x 162cm)
Size #14 (Fourteen) 2 2/3′ x 5 1/3′ (32″ x 64″ / 81cm x 162cm)

**Individual Code of Signal Flags are made to order, please allow up to 8 business days for shipping.**


The First (1st) Substitute code flag holds significance in boating and yachting as it represents a specific numeric message. This nylon flag is designed with meticulous attention to detail and features a sewn design. It is available in various sizes: Size 0 (2/3’x1 1/3′), Size 2 (1′ X 2′), Size 3 (1 1/3’X2 1/3′), Size 7 (2’x4′), Size 10 (2 2/3’x5 1/3′), and Size 14 (2 2/3’x5 1/3′).

The first (1st) substitute code flag is an important element in boating and yachting. The first substitute flag replaces numerical flags 1 to 9 when multiple flags of the same number are needed. When flown alongside the corresponding numerical flag, the first substitute flag indicates the first occurrence of a number. When raising the number 3 flag twice, indicate it with the first substitute flag followed by the number 3 flag. This allows for efficient communication of numeric information using a limited set of flags. The nylon flag with a sewn design ensures durability and is available in various sizes for different visibility requirements.

The nylon flag’s sewn design ensures durability, making it suitable for the marine environment and ensuring longevity. With a range of sizes available, you can select the appropriate flag size to suit your needs. The first (1st) substitute code flag is vital for effective communication and numeric transmission in boating and yachting activities. It is an important component of maritime communication.

Our collection features an extensive range of International Code of Signals flags, including all alphabet flags from A to Z. Additionally, we offer flags representing the numbers 1 through 0. For added versatility, we provide three substitute flags to cater to specific signaling needs. You’ll also find the indispensable answering pennant among our offerings.

When it comes to sizes, you can choose from a variety of options to suit your requirements. We offer Size 0, Size 2, Size 3, Size 7, Size 10, and Size 14, ensuring there’s a flag that perfectly fits your intended purpose.

In conclusion, to ensure durability and an attractive appearance, we exclusively craft our flags with a canvas heading and brass grommets. Lastly, the materials used enhance durability and elegance in every flag in our collection, adding strength and style.

Additional information

Weight 0.12 lbs
Choose Size & Style

Size #0, Grommets, Size #10, Grommets, Size #14, Grommets, Size #2, Grommets, Size #3, Grommets, Size #7, Grommets


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